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The higher the silica content of the magma, the more viscous the magma.

The higher the viscosity of the magma, the more explosive the eruptions of the volcano tend to be.

Lower silica content lavas tend to form shield volcanoes (such as the type formed on Hawaii) where the lava can flow very long distances as it has a much lower viscosity.

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How can the composition of magma affect the way volcano erupts?

If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.


What does the amount of silica in a volcanos magma determine about its eruption?

If a volcano's magma is high in silica, the volcano will probably erupt explosively. If the magma is not high in silica, the volcano will probably erupt quietly.


How does magma composition and the resulting eruption affect the form of a volcano?

If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.


What is an eruption called when the magma is thin runny and contains very little silica?

An eruption with thin, runny magma containing very little silica is called an effusive eruption. This type of eruption usually results in lava flows that can travel long distances from the volcano.


What is the relationship between silica or water content of magma and materials ejected from an volcano?

The concentration of silica and water content in magma influence the force with which it is ejected from a volcano. The higher the levels of water and other gasses as well as the more silica it contains, the more explosive the eruption will be.


What are the phases ofa volcano?

A volcano starts when a hole in the ground leeks magma. It lays out around the hole that started. It will take a while but eventually a big volcano will stand. It will be a composite volcano a shield volcano or a cinder cone volcano. The eruption wont always be explosive. It depends on the amount of silica in the lave. If it has alot of silica it will be explosive. If is low in silica it will ooz out. If you would like to know more go to www.newsdial.com Nature Natural Disasters .


Who did Mount St Helen's eruption affect?

local people and the environment in which the volcano was in.


What kind of eruption is produced when basaltic lava that is low is silica flows from a volcano?

quiet nonexplosive eruptionsquiet nonexplosive eruptionsquiet nonexplosive eruptions


Should you be worried about a volcano with a low water content and a low silica content?

Yes. While the most dangerous eruptions involve magma that is rich in silica and water, any volcanic eruption can be harmful.


What kind of eruption is produced when basaltic lava that is low in silica flows from a volcano?

A basaltic lava eruption that is low in silica tends to produce effusive eruptions. These eruptions are characterized by relatively gentle and steady flows of lava, rather than explosive eruptions with ash and pyroclastic material. Basaltic lava flows easily due to its low viscosity, allowing it to travel long distances before cooling.


Which factors determine how violent an eruption will be?

· It is determined by the primary factors of the magma's Temperature, its Composition, and the amount of Dissolved Gases it contains.


What is the relationship between the silica contents of magma and the explosiveness of a volcanic eruption?

The high the silica content, the explosive and the eruption.